on loughner's 22 years. obviously, they're particularly interested in the days and weeks prior to the shooting, but law enforcement at this point in time not sharing with us any of the details. they are still looking for people who knew loughner to try and get more. still no indication, this source says, that there were any other people involved. no indication that he had any links to any groups. they're still, of course, trying to come up with a motive for all of this. and this final note, wolf, we are told by administration officials that both the attorney general, eric holder, and the secretary of homeland security, janet napolitano, will both be in tucson tomorrow for that memorial service. >> i know the president personally dispatched the fbi director, robert mueller, to lead this investigation. he went there over the weekend. is he still there, leading the investigation, or has he delegated to other fbi agents? >> reporter: no, he came back late yesterday, wolf. he's back in washington now. >> all right. the fbi, the lead investigation on in case. thanks, jeanne. thanks very, very much.